\name{OpenLargefiles}
\alias{OpenLargefiles}
\title{This function loads large data set made from tab delimited files}
\description{
 The function creates and expressionSet starting from al file containing the expresison data in a tab delimited format.
 This file is loaded together with the description of the clinical paramenters present in Target 
 This function uses a specific configuration of Target column of the affylmGUI target file.
 To know more about target file see affylmGUI help.
 Each row of the column named Target, in the affylmGUI target file, describes the clinical parameters.
 Each clinical parameter is separated from the others by an underscore. 
 The affylmGUI target file will look like:
\tabular{lll}{
 Name \tab	FileName \tab	Target \cr
 mC1  \tab	M1.CEL	 \tab 	\code{pos_yes_1_NA_0} \cr
 mC2  \tab	M4.CEL	\tab \code{pos_no_2_NA_0} \cr
 mC3  \tab	M7.CEL	\tab \code{neg_no_3_pos_0} \cr
 mE1  \tab	M3.CEL	\tab \code{neg_yes_3_neg_0} \cr
 mE2  \tab	M6.CEL	\tab \code{neg_no_NA_1_0} \cr
 mE3  \tab	M9.CEL	\tab \code{neg_yes_3_pos_0} \cr
 mI1  \tab	M2.CEL	\tab \code{pos_no_2_neg_1} \cr
 mI2  \tab	M5.CEL	\tab \code{pos_yes_2_pos_1} \cr
 mI3  \tab	M8.CEL	\tab \code{pos_no_2_pos_1}
 } 

}
\usage{OpenLargefiles()}
\author{Raffaele A Calogero}
\keyword{utilities}